Portable tablet computer stand



FIG. 1 is a perspective view of a portable tablet computer stand showing my new design;

FIG. 2 is a perspective view thereof, but showing the stand in a second position;

FIG. 3 is a perspective view thereof, but showing the stand in a third position;

FIG. 4 is a top plan view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a front view thereof. 

CLAIM The ornamental design for a portable tablet computer stand, as shown and described. 